TeckNet PowerWave W2 13000mAH 15W 2-Port USB Portable Charger External Battery Power Bank with BLUETEK Smart Charging Technology (2A Input) for Mobile Phone and Tablets Features cutting-edgeBLUETEK&trade; Technology which identifies and optimises USB power compatibility of devices from Apple, Samsung and many other devices to enable faster recharge rates up to 2.4A Per Port 13000mah Huge Capacity: Charges the iPad Air once, the Galaxy S5 over three times, the iPhone 5s almost six times and other smartphones multiple times. Recharges in 6.5 hours with a 2 amp adapter (not included) and the included Micro USB cable. Superior Quality: Premium SAMSUNG cells, Fail-safe circuitry and a sturdy gloss exterior ensure reliability and safety Fast Charging Technology: PowerIQ and VoltageBoost combine to deliver the fastest possible charge up to 2.4 amps per port. Recharges itself in 7 hours with a 2 amp charger, phone chargers (generally 1 amp) may take up to 15 hours Package contents: TeckNet iEP1200, Manual, USB Charging Cable, 18-month warranty and friendly customer service.